12099640 has 64 divisors (see below), whose sum is σ = 31564800. Its totient is φ = 4088448.

The previous prime is 12099611. The next prime is 12099643. The reversal of 12099640 is 4699021.

It is a happy number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (12099643) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 21847 + ... + 22393.

It is an arithmetic number, because the mean of its divisors is an integer number (493200).

Almost surely, 2^12099640 is an apocalyptic number.

12099640 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 12099640, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (15782400).

12099640 is an abundant number, since it is smaller than the sum of its proper divisors (19465160).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

12099640 is a wasteful number, since it uses less digits than its factorization.

12099640 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 644 (or 640 counting only the distinct ones).

The product of its (nonzero) digits is 3888, while the sum is 31.

The square root of 12099640 is about 3478.4536794386. The cubic root of 12099640 is about 229.5747656469.

The spelling of 12099640 in words is "twelve million, ninety-nine thousand, six hundred forty".